Annual report pursuant to Section 13 and 15(d)

Net Loss per Share (Details Textual)

v3.8.0.1
Net Loss per Share (Details Textual)
12 Months Ended
Dec. 31, 2017
$ / shares
Warrants [Member] | Minimum [Member]  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 1.50
Warrants [Member] | Maximum [Member]  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price 7.43
Stock options [Member] | Minimum [Member]  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price 1.30
Stock options [Member] | Maximum [Member]  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 4.50